Edited Feature: TimeSpanUpDown : Possibility to hide seconds [22262]

Based on discussion http://wpftoolkit.codeplex.com/discussions/654514.

Use wants to hide the seconds in the TimeSpanUpDown.
Comments: ** Comment from web user: BoucherS **

Fixed in v3.1.
The new Property TimeSpanUpDown.ShowSeconds will let you show/Hide the seconds from the TimeSpanUpDown.